If a project has Telegram Community and there is an admin with the name “Dan Joe” and you get a PM from the same name person, then don’t just believe him/her as they can use the same name but you have to verify the user from the community or by cross-check his username by clicking on the user name.
My advice is that you/they should try to minimize the usage of telegram for business related issue because telegram is just like a den of scammers, I have received several messages from those claiming to be part of the team of a project and after I make enquiry in their official telegram group chat they all deny not to know such person and that they don't work for them. Most times this happens when you try to ask of solution to a certain problem you're facing and then boom you'll see your PM flooding your telegram trying to provide your with solutions and at the end they'll want you to give them some of your personal information.