@Ian Mathews Do you have required license for Azure AD SSPR? To use password writeback, you must have one of the following licenses assigned on your tenant:
- Azure AD Premium P1
- Azure AD Premium P2
- Enterprise Mobility + Security E3 or A3
- Enterprise Mobility + Security E5 or A5
- Microsoft 365 E3 or A3
- Microsoft 365 E5 or A5
- Microsoft 365 F1
- Microsoft 365 Business
Refer to https://learn.microsoft.com/en-us/azure/active-directory/authentication/concept-sspr-writeback#licensing-requirements-for-password-writeback for more details.
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