Cannot sign-in during the morning.

It may to do with the very high demand due to the situation around the world.

Gaming is many things to many people around the world. It’s entertainment, it’s connecting with friends and loved ones, it’s a much-needed break, especially in times like these.

Like many of you, we’re adjusting to the effects of the Covid-19 pandemic. The health and safety of our staff is a top priority at this time, but rest assured, we’re also committed to taking care of your Xbox support needs.

A few important notes:

• We’re experiencing heavy support volume at the moment, and waiting times may be longer than usual.
• Out of concern for our advocates, we have adjusted our hours in some regions and are doing our best to keep that information current on the site.
• You can always search this site for help – there’s a good chance that the answer to your problem is ready and waiting. Or if you’re signed in on your console, go to Xbox Assist.
• You can manage your subscriptions and payments by visiting https://account.microsoft.com/.
• Stay in the know about your games, apps and services by checking the Xbox Live service status.
• See Microsoft’s commitment to customers during COVID-19.

Thank you for playing on Xbox!

that did it lol. as soon as i got another achievement, the other one showed up. thank you for the tip.

If you have any further issues, please see
this post, and follow up in the
Support forum as directed by Mister Fitzer. Thanks again.

So is this whole mess sorted? If I play today, is there a chance I can be temporarily reset to 0?

My gamerscore and achievements were wiped out. I called customer service and all I had to do was delete my profile and retrieve it back. Everything was back to normal.