Do you live in a supported MySudo country?
Vereinigte Staaten, 
Vereinigtes Königreich, 
Kanada, 
Australien, 
Neuseeland, 
Singapur
Have you activated microg under System/microG with all options including add Google account?
Have you tried to import an existing profile from another working phone via QR code?
If its tree times yes and it is still not working then it probably never will ;- )