Strange mail address

Copper Contributor

Hello, I'm using a email address removed for privacy reasons mail address. Since I started an account (via Microsoft 365) my messages are sent under an unknown address, not under my original address which I linked to my account. A strang address: 'xxxxxx[long name]email address removed for privacy reasons' occurs, which I never installed. Since then it takes a long time to send and receive messages, and my recipients don't trust that strange address, which I can understand. I tried everything to delete/change that address, but I can't find it back in my profile settings, also not as an alias. I've read the suggestions by Microsoft support, but they don't work and I can't get any help by phone. Does anyone know what is happening here and how I can resolve this problem?

Thanks for your suggestions!

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