My project administrator in our organization set up a wiki for our project; however, I can only read the wiki and cant create any sub wiki pages or delete. I requested for my permissions to be "Contributor" and even changed my account to "Project Administrator" and still I cannot create new Wiki pages/Sub pages.
Please give me instructions on how a project administrator can grant me permissions for creating wikis and sub-wikis.
I tried going to Project settings -> Permissions -> name of user/group.
but see nothing regarding setting up wiki permissions.

I even tried modifying the wiki security settings following this link:
Yet still no change.
I tried to reproduce the same in my environment and got below results:
I have one Devops Private project
sriin which I addedDeviuser as Project Administrator like this:When I signed in with
Deviuser, I'm able to read existing wiki's but unable to add subpage or edit it as those options are greyed out like below:From this MS Documentation,
When I checked access level of
Deviuser from Organization's settings, it isStackholderlike below:In your case, check if your access level is
Stakeholderand change it toBasicaccess level by assigning proper license.When I signed with other user having
Basicaccess level, I'm able to create sub pages in Wiki successfully like below:Reference: Stakeholders or users not able to edit AzureDevOps Wiki by Shan