Google Play App Integrity API works for full app but not instant app

Question

I'm trying to add instant app support to my existing app. My app has app integrity enabled and it passes when I run the full app locally. When I run the instant app locally however it fails. Are there additional steps that I need to undertake to get the Google Play app integrity API to work with an android instant app? The error I'm receiving is below:

HTTP Client: RESPONSE: 200 
METHOD: HttpMethod(value=POST)
FROM: https://mobile.test.com/attest/initiate
COMMON HEADERS
-> Connection: keep-alive
-> Content-Type: application/json
-> Date: Wed, 20 Mar 2024 17:33:04 GMT
-> Transfer-Encoding: chunked
BODY Content-Type: application/json
BODY START
{"id":"1e08f389-3fb1-41f9-89de-73a30f22627a","challenge":"080d7584-cc65-4882-9373-48f2094ff873"}
BODY END
INTEGRITY_API - key is null, getting token
UID: [11277]  PID: [998] IntegrityService : requestIntegrityToken(IntegrityTokenRequest{nonce=080d7584-cc65-4882-9373-48f2094ff873, cloudProjectNumber=null, network=null})
UID: [11277]  PID: [998] IntegrityService : Initiate binding to the service.
UID: [11277]  PID: [998] IntegrityService : ServiceConnectionImpl.onServiceConnected(ComponentInfo{com.android.vending/com.google.android.finsky.integrityservice.IntegrityService})
UID: [11277]  PID: [998] IntegrityService : linkToDeath
UID: [11277]  PID: [998] OnRequestIntegrityTokenCallback : onRequestIntegrityToken
UID: [11277]  PID: [998] IntegrityService : Unbind from service.
INTEGRITY_API - token fetched = eyJhbGciOiJBMjU2S1ciLCJlbmMiOiJBMjU2R0NNIn0.aiK93UfZDzqAyHqq0uYE0zQnYBLFCSQKLMKwBjqWdKYJxwa4evfPOg.L5XG_-SLX9K-iSJR.Wx4eHtrFS7i_8LCUOSS2stgIlMh8cYODviwWc6MPdJ8DpucONA5fcjf7P1ZM7_xZgji8Y1UIRUnx7YzGxNbxgVVOg1drQkJwcu7Qkv3EcfvTQ7I7Ih7sFSJ8LFIFqRKJ-_iCCcBW3VzcWYhAXFgG9nJCIqnkaz6ZNdAb5boq8YykRyBQnJGo1QZAqEHaCss8hBGVMCYvZGd5IyKrnQodMKpTlDnTO5Ge_pn5pW2ys4-JmkMSVpcP5ZGVg0EO93RVv1Ztzco_LRhdB5aVhRDShpmImPmEubK7BJInOpVRgxCQHwQdTfWh_EQes9WW-gCGzzYNPOPyCmBEeoPDPoo649T9Dz-Was0BZA6L6iIiUYSVH6_U_HkTDVSStdH923YRwKZ-L4MhwE2PJ8F3tsgohAmX8xoqc_vZ490sgyby63O2s08aBhqxW7QJGmaz-mGL5aUvhxIsu_Ws_LigIvlYPMykM0cukNBRz8XD19R9oTGUE2fjM_Ydo1VNZPmk4vAFc3_gDxrPlczRtd165l7mYrYhH8J-uT8kAzVrZtqChEm2QryUd98137mTVPjANKu0Ycx3aCVRwV5-xj5ye0f1DREafZtOHAfVlhiViTx3FMlsCDF-flbwlRcOEF2DivHAx870l70w9gV9Sro-QUVsmQV_NhDaXnUELTs4Og9EKoyuIJ-G0xPY2MOMT_x2_nSu79FjQIb2NFa-SSt4BjvQShVv_69LV8cq8Wi17N6_EKuuzNTZsz3sBQ_SBRIbZfI4lSWpyLlYekolyuUTN_YA4JDalg0f-ukt9_xGcAnY0rp6xcx9C-LCXPkHnGkodziAO3KPos0Uqd9MrlD4rn_m3vMg5X1Om_CdEaIH9_ECWCmRsQTcVlnklZwRaRjfHszEflKPPH41ajMoVpvwFYtZf2yVmDParsx5PBHS7sCNxKPEEb4JyUAnezIywoBwJahkKCK8GO9SWtqlicMFduFFZ1Pm0P2wotU73Qflw8b07N3lgf0IF8onzlU-AQYQpOKVwBh1vQWDyAEgqXJax7SeHQ5qtTovYYLgKhgpYq_6pHK3dLHr3N4FlV4jFjej6jirkua2Tla2Wj8w7inr3WLQsvtINC2vPsQ.rTOdQ1UXOGfj0-ObclpgIQ
HTTP Client: REQUEST: https://mobile.test.com/attest/validate/android
METHOD: HttpMethod(value=POST)
COMMON HEADERS
-> Accept: application/json
-> Accept-Charset: UTF-8
CONTENT HEADERS
-> Content-Length: 1365
-> Content-Type: application/json
BODY Content-Type: application/json
BODY START
{
    "id": "1e08f389-3fb1-41f9-89de-73a30f22627a",
    "deviceId": "54416d35432dba1d",
    "verdict": "eyJhbGciOiJBMjU2S1ciLCJlbmMiOiJBMjU2R0NNIn0.aiK93UfZDzqAyHqq0uYE0zQnYBLFCSQKLMKwBjqWdKYJxwa4evfPOg.L5XG_-SLX9K-iSJR.Wx4eHtrFS7i_8LCUOSS2stgIlMh8cYODviwWc6MPdJ8DpucONA5fcjf7P1ZM7_xZgji8Y1UIRUnx7YzGxNbxgVVOg1drQkJwcu7Qkv3EcfvTQ7I7Ih7sFSJ8LFIFqRKJ-_iCCcBW3VzcWYhAXFgG9nJCIqnkaz6ZNdAb5boq8YykRyBQnJGo1QZAqEHaCss8hBGVMCYvZGd5IyKrnQodMKpTlDnTO5Ge_pn5pW2ys4-JmkMSVpcP5ZGVg0EO93RVv1Ztzco_LRhdB5aVhRDShpmImPmEubK7BJInOpVRgxCQHwQdTfWh_EQes9WW-gCGzzYNPOPyCmBEeoPDPoo649T9Dz-Was0BZA6L6iIiUYSVH6_U_HkTDVSStdH923YRwKZ-L4MhwE2PJ8F3tsgohAmX8xoqc_vZ490sgyby63O2s08aBhqxW7QJGmaz-mGL5aUvhxIsu_Ws_LigIvlYPMykM0cukNBRz8XD19R9oTGUE2fjM_Ydo1VNZPmk4vAFc3_gDxrPlczRtd165l7mYrYhH8J-uT8kAzVrZtqChEm2QryUd98137mTVPjANKu0Ycx3aCVRwV5-xj5ye0f1DREafZtOHAfVlhiViTx3FMlsCDF-flbwlRcOEF2DivHAx870l70w9gV9Sro-QUVsmQV_NhDaXnUELTs4Og9EKoyuIJ-G0xPY2MOMT_x2_nSu79FjQIb2NFa-SSt4BjvQShVv_69LV8cq8Wi17N6_EKuuzNTZsz3sBQ_SBRIbZfI4lSWpyLlYekolyuUTN_YA4JDalg0f-ukt9_xGcAnY0rp6xcx9C-LCXPkHnGkodziAO3KPos0Uqd9MrlD4rn_m3vMg5X1Om_CdEaIH9_ECWCmRsQTcVlnklZwRaRjfHszEflKPPH41ajMoVpvwFYtZf2yVmDParsx5PBHS7sCNxKPEEb4JyUAnezIywoBwJahkKCK8GO9SWtqlicMFduFFZ1Pm0P2wotU73Qflw8b07N3lgf0IF8onzlU-AQYQpOKVwBh1vQWDyAEgqXJax7SeHQ5qtTovYYLgKhgpYq_6pHK3dLHr3N4FlV4jFjej6jirkua2Tla2Wj8w7inr3WLQsvtINC2vPsQ.rTOdQ1UXOGfj0-ObclpgIQ"
}
BODY END
tagSocket(129) with statsTag=0xffffffff, statsUid=-1
HTTP Client: RESPONSE: 403 
METHOD: HttpMethod(value=POST)
FROM: https://mobile.test.com/attest/validate/android
COMMON HEADERS
-> Connection: keep-alive
-> Content-Type: application/json
-> Date: Wed, 20 Mar 2024 17:33:06 GMT
-> Transfer-Encoding: chunked
BODY Content-Type: application/json
BODY START
{"message":"Validation failed app"}
BODY END
INTEGRITY_API - onFailure = io.ktor.client.plugins.ClientRequestException: Client request(POST https://mobile.test.com/attest/validate/android) invalid: 403 . Text: "{"message":"Validation failed app"}"
Value is too long; discarded. Value kind, name, value length: param, result, 133
HTTP Client: REQUEST: https://api.cove.test.com/logs/VENDORID/54416d35432dba1d
METHOD: HttpMethod(value=POST)
COMMON HEADERS
-> Accept: application/json
-> Accept-Charset: UTF-8
CONTENT HEADERS
-> Content-Length: 292
-> Content-Type: application/json
BODY Content-Type: application/json
BODY START
{
    "log": "result=Client request(POST https://mobile.test.com/attest/validate/android) invalid: 403 . Text: \"{\"message\":\"Validation failed app\"}\"\ncove_error_type=app_attestation\nversion=2.0.1.77\nbuild=77\ndevice=oriole\nos=34\nvendor_id=54416d35432dba1d\nenvironment=prod"
}
BODY END