Hi @Ell
I understand you're trying to create a new identity as an Individual Developer, but the "New Identity" button is currently greyed out.
This is due to a recent update from Microsoft. As of April 2, 2025, Trusted Signing is only available to organizations based in the US and Canada with at least three years of verifiable history. Because of this change, individual developers and organizations from other regions are unable to start the identity validation process during the public preview.
Microsoft has stated that they plan to expand access more broadly once the service reaches general availability.
For more details, please refer to the following document: Trusted Signing Public Preview Update
Hope this helps. Do let us know if you any further queries.