Realms tab is gone again and so is enter a code to join realms

When minecraft first came out for the bedrock edition my realms worked for a few days then my tab wouldn't show up and the only way I could join my realm was by putting in the code in the join by code tab then an update was released like last week and it was fixed my realms tab was back!! Then today another update came out the realms tab is gone again and now so is the join by code and its not on 1 Xbox its on them all please fix this im paying money for something I cant even access!