Invalid login data on 2nd install

Hello there "again",
it seems (your posts = 0) that my first post about my issue got lost somehow? So I give it a second try:
I bought DD via GOG recently, installed it on my Win PC and dived into it (with some not-so-minor pre-experience on the free alpha). Then I created an account with the purchased key and synced into the cloud.
Third step was a 2nd installation on my upcoming linux machine, went flawlessly... beside the fact that I cant sync because it didnt accept my account information (invalid)?! Tried several times, even resetted the password once - same result.
Cross-check: a try to use the account for the web version succeeded instantly.
Is there any barrier I dont see, anything I can do? How do I sync between windows and linux??
Another strange notice from the research (and maybe helpful): trying to 'create a new account' on the linux with the same data doesnt refuse is as 'already in use' (expected) but as 'invalid key' instead...?
hopefully waiting
MrCee
it seems (your posts = 0) that my first post about my issue got lost somehow? So I give it a second try:
I bought DD via GOG recently, installed it on my Win PC and dived into it (with some not-so-minor pre-experience on the free alpha). Then I created an account with the purchased key and synced into the cloud.
Third step was a 2nd installation on my upcoming linux machine, went flawlessly... beside the fact that I cant sync because it didnt accept my account information (invalid)?! Tried several times, even resetted the password once - same result.
Cross-check: a try to use the account for the web version succeeded instantly.
Is there any barrier I dont see, anything I can do? How do I sync between windows and linux??
Another strange notice from the research (and maybe helpful): trying to 'create a new account' on the linux with the same data doesnt refuse is as 'already in use' (expected) but as 'invalid key' instead...?
hopefully waiting
MrCee