In the AT command interface documentation, in the 27.7 Device Services Indications +WDSI section, you have the event meaning (page 198):
Event: 4 => the embedded module starts sending data to the server
Event: 5 => authentication with the server failed
Event: 6 => authentication has succeeded, a session with the server started
Event: 7 => session with the server failed
Event: 8 => session with the server is finished
In you case, event 5 shows clearly the issue.
Can you check the imei and S/N from your device:
Then can you reboot your device (if you didn’t do it each day) and test again with at+wdss=1,1 command.
Finally, can you confirm you only switch on your device after the portal configuration in the Register activity?
We can see your device on the portal log and the credentials sent are not correct.
Your device seems in bad state.