Sign-in has three parts, and each has its own route back in.
The email address
The account is the email address it was invited to. Where someone has more than one, the invitation went to one of them specifically.
An address that has changed does not carry the account with it. Updating it is done from account while signed in.
The password
Resetting it sends a link to the address on the account. The link is time-limited, so an old one from a previous attempt will not work and a fresh reset is needed.
The message arrives from the platform's sending address, and is worth looking for in spam where it does not appear.
The second factor
Where two-factor sign-in is enabled, a code from the authenticator application is required after the password.
Codes are time-based, so the clock on the phone matters. A device whose time has drifted produces codes that are rejected, and setting the clock to update automatically resolves it.
Recovery codes issued at setup are the route in when the device is unavailable, which is the reason for storing them somewhere other than the phone.
A new device
Signing in from an unfamiliar device may require confirmation by email. This is expected rather than a restriction on the account.
Signed in, but something is not available
That is a role rather than a sign-in question — see roles and permissions and I cannot see something I expect to.
If none of these apply
Support can confirm which address holds the account and reissue an invitation — see getting help.