Hi @Lakshman Dirisala ,
Thank you for posting query in Microsoft Q&A Platform.
You mentioned that you have
user administrator access. Assuming its not typo, It seems its not built-in
User Access Administrator which is available at subscription level.
Could you please try to get
User Access Administrator role at subscription level and retry? Please let us know how it goes.
Below few links where similar details discussed:
Hope this helps. Please let us know if any further queries.
Please consider hitting
Accept Answer button. Accepted answers help community as well.