Adding an account to a group

Aly_Smith Posts 1 Registration date Thursday October 29, 2020 Status Member Last seen October 29, 2020 - Oct 29, 2020 at 02:27 PM

I have a Facebook messenger account and a messenger account and I can switch between the two on my phone. I am part of a messenger group using my Facebook account. How do I add my other account? When I do a search to add it, it doesn’t appear.