The help.mojang.com customer service link now links to a page that says 'please visit our page at help.minecraft.net.  The new page does not appear to provide a customer service link.  The old support.mojang.com site does not even load.

Related info (what I really need) - I can log into 2 microsoft accounts, but neither set of credentials let me log into minecraft.  I was logged in 48 hours ago.  Password reset does not help.  Migrating the account says it's already there.  Help file says to contact customer support if it doesn't work within 24 hours, which brings us back to this issue.

https://minecraftirc.net/minecrafthelp/landing/  provides a series of steps for common situations, and ends with saying if it still fails, "comeback here and select "No" when you answer this question."  As it turns out, 'No' is not an option on the page.