The usual Microsoft alert scam.
phone #: 1-(888)-691-0071
website: http://206.189.64.82/systemerror-win-ff/
*If you go to that website, it won’t have the number because the URL had a bunch of tags in it that determine the number—including your IP. I think this is just the empty shell for scammers to customize.
I called them and they claim to be pcfix247.com and I recorded it https://youtu.be/1dawOmcMfww