Error code: pufferfish

Am highly frustrated with the newest update. Not long after the highly anticipated-by-my-kids Caves & Cliffs update launched, they were no longer able to log in due to error codes: pufferfish & piglin. I have restarted, deleted Minecraft, rePURCHASED Minecraft, am not able to change any storage permissions…nothing works. Needless to say, my kids are devastated. They’ve been playing Minecraft for years & now that they just received new kindles, we all thought the problem would be resolved. It has not. Please fix this ASAP.