If they know the correct email and password they should not have problems with logging in.
The above link is a way to get access to the account if the email is correct and are able to receive a recovery email.
Without the details it could also be that they just got invited, but never was active to set a permanent/their own password, In that case ask them to see the welcome mail they got to see if they got a temporary password or try re-clicking the invite link.
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