I would gladly copy all my info to a new correct ticket if it helps.
I tried the suggestion of 4 times in a row login attempt register code each time. No luck.
Gregory. I did the same thing. I signed up specifically for how big this issue is and it may never get resolved from what I am seeing.
I tried again today no luck. This is quite a long time for this issue. I would honestly return the cartridge if I could. I would rather play on another platform that I would get to keep the progress. This long of an issue is not giving me confidence that it will get fixed soon and if it does if it will stay fixed.
Katherine It wont work unless you delete your save data. Its not a good solution. Then if you redownload your save again from the cloud it will stop working again. I don't understand why it only happens to some of us. My son has tons of save worlds on his. I shrunk down to 1 that I wanted to keep and still cant get logged in. Ridiculous!
Harley I did an email ticket to Mojang and heard nothing also. Got a response once from their twitter support telling me to reach out to Microsoft who of course said not their issue. I think its a Mojang issue since deleting the save file works.
I tried again today still no luck.
I have also had this issue the past 3 days. I contacted Mojang they sent me to Xbox Live support. Talked to Xbox Live support they told me to go to Nintendo. I did not reach out to Nintendo. I tried uninstalling/reinstalling game twice. I tried 2 different wifi networks for both the switch and the device I'm validating the code on. No luck for the 3 days. If I delete my save data I was able to login however once you download the save data from the cloud it again will not work. I only have one world I wanted to save so removed the rest but still does not matter. I also have my son on a different switch. He is a child account underneath my Microsoft account. Oddly enough his is still working. We both had the latest version of the game. I really have no clue how to get this working while retaining my save world. I guess I could start again but not really wanting to. Be even worse if it happens to my son he has a ton of worlds.
I finally received a reply from my Mojang support email. They stated it should be resolved. I downloaded a patch on my switch and it is now working properly for me. Check today and see if it works for you also.