Scenario
I am running Photo (1.10.4.1998) Windows 10 Home (software is up to date)
Launch Photo. Observe you are prompted to register or Sign in
Click Already Registered? Sign in now! > Observe "Please wait a moment"
Observe "Were Sorry Something went wrong during registration or sign-in" and observe "Timeout while waiting for registration service "ready" notification"
click Try again
or click Remind me later
Result:
If click Try again the process repeats
If click Remind me Later nothing seems to happen
Note: Publisher and Designer seem to have retained my registration key
NOTE: I can repeat this scenario by selecting Help > My Account and getting the My Account screen