Using classic Outlook for Windows in business environments
I have tried a similar fix and it works on my PC, but not on my laptop! I thought the whole justification for roaming signatures was that they would be accessible from whatever machine you logged into your account - not so!
Microsoft really know how to bugger things up and while they're at it they should look at the mysterious disappearance of 'replied to' icons which is the subject of another thread here and has been going on for years without a fix. Incredibly frustrating to reply to an email and not see it recorded by the icon. Works sometimes but not always!