Thankyou Evado,
Now it is solved, I got mail from support@epsolarpv.com they mixed up my e-mail with someone else quite like mine.
Through analysis, during the migration of the EPVER Pair platform account to Solarguardian, an error occurred in the email information, causing this problem. Now that the technician has corrected the email address of the account, please use your account(******) and password to log in, you can monitor the device, and you need to add WiFi A again