Unable to bootstrap EC2 server with user data

Question

I am creating an AWS EC2 t2.micro and using the below user data. I added the condition to check for the presence of the "BootstrapCompleted " file and run updates AFTER that.

    #!/bin/bash
    while  [  ! -f /tmp/BootstrapCompleted ]
    do
      sleep 300
    done
    echo "file found" >> /tmp/ameya.log
    echo -e "Ameya is going mad" >> /tmp/ameya.log
    sleep 120
    yum update -y >> /tmp/ameya.log
    echo -e "\n My Sanity is restored" >> /tmp/ameya.log

However, when I do SSH to the VM and run

yum update -y

It runs the updates meaning they are not installed with User Data.

P.S: As per Amir, I checked the log file

cat /var/log/cloud-init-output.log

I see some issue here. Last few lines output as below.

Cloud-init v. 22.1-5.el8 running 'modules:config' at Thu, 23 Feb 2023 01:59:01 +0000. Up 101.14 seconds.
Errors during downloading metadata for repository 'epel':
  - Curl error (6): Couldn't resolve host name for https://dl.fedoraproject.org/pub/epel/8/Everything/x86_64/repodata/repomd.xml [Could not resolve host: dl.fedoraproject.org]
Error: Failed to download metadata for repo 'epel': Cannot download repomd.xml: Cannot download repodata/repomd.xml: All mirrors were tried
Cloud-init v. 22.1-5.el8 running 'modules:final' at Thu, 23 Feb 2023 02:00:10 +0000. Up 170.00 seconds.
Cloud-init v. 22.1-5.el8 finished at Thu, 23 Feb 2023 02:02:12 +0000. Datasource DataSourceEc2Local.  Up 291.76 seconds

I note that ameya.log is created as per below.

[root@ANL62600251 ~]# cat /tmp/ameya.log 
file found
Ameya is going mad
Extra Packages for Enterprise Linux 8 - x86_64  0.0  B/s |   0  B     00:00    

 My Sanity is restored

I now run

yum update

Interesting observation is

yum update
Extra Packages for Enterprise Linux 8 - x86_64                                                          6.5 kB/s | 4.7 kB     00:00    

This tells me that, when yum update was running it had no internet connection?