Email Signatures vanishing - New Outlook

I experience a similar problem and suspect it is related. All of my custom signatures disappeared and there is now only one signature option for all mailboxes connected to my profile. I'm small business but on M365 and latest version of Outlook. Either way, the signature field was cleared out and I have to now choose which signauture to use by recreating it. I just copied from a previously sent email, but I'll have to manually copy/paste for each distinct mailbox account I have.

Below is my chat with Copilot a few moments ago...

ME: "It appears the option to create custom signatures for each mailbox account in Outlook client is no longer available and only one signature can be customized for all mailbox accounts."

COPILOT: "You're right—Microsoft has made changes to how signatures work in the Outlook client. Previously, users could set different signatures for each mailbox account, but recent updates appear to have streamlined this feature, allowing only one signature to be customized across all accounts. If you need multiple signatures, you might have to manually switch them when composing emails or use third-party tools like CodeTwo Email Signatures 365, which offers more flexibility. Another workaround is to create multiple signatures in Outlook and insert them manually when needed."