How to disable Outlook Signature sync across devices

Our company has a generic email account for email address support@xxx, and we all have our own signatures so the recipient knows who they are dealing with from the Support team.

A Windows Update to my company's Desktop version of Outlook in the past few weeks has introduced syncing of our signatures across all our devices. Is there a setting that can disable this syncing? I tried the following setting on all devices, which has not worked as expected.

The only other solution I have found suggests editing the registry but I am reluctant to do this across the company as there must be a better solution. https://techcommunity.microsoft.com/t5/microsoft-365/turn-off-signature-synchronize-outlook/m-p/3685421