Error 429

This appears to be a duplicate of REALMS-6147. See this link for further details regarding this problem.

I'm having the exact same problem, seems to be a common issue the last couple of months

Benjamin Schram, If you feel that this issue is affecting you, feel free to vote for the duplicated ticket (REALMS-6147), to give Mojang a basic idea of how many people are impacted by the problem. Just to further inform you, this will not determine how quickly the bug gets handled or fixed. Like I said earlier, it just gives the team a general understanding.

I solved the problem by uninstalling and reinstalling minecraft, i have not lost anything