Hi there and welcome
Can you tell me the make and model of the phone please?
Can you click on my link below and tell me please if you can sign into your gmail account that you used on the S7, there please
Please let me know.
ok, and when you enter that gmail and password ***** the phone
ok, but if it says this it is not this account, can you try to think of another account please you used?
ok, but if it says it is not it, then you set a different one when setting up the phone
Use this to try to discover what you set please