@rhett music Glad to know issue is resolved and I appreciate your effort in sharing the solution. Your contribution will undoubtedly assist others facing similar challenges.
As the [Microsoft Q&A community follows a policy where the question author cannot accept their own answer] {https://learn.microsoft.com/en-us/answers/support/accept-answer}, I've reposted your solution.
If you feel that my engagement helped kindly accept as "Yes", so that you can help others in the community looking for remediation for similar issues.
Scenario : App service deployment or scaling
Issue: Error " The subscription '<id>' is not allowed to create or update the serverfarm."
Workaround:
Retry to provision the App Service after a few hours (similar thread #1535067 user was able to fix the problem). If your requirement fits, try deploying in a different region.
If you continue to receive this error, please raise a a support ticket for a closer investigation.