Macbook wont load some web pages that require logins

Hello, My MacBook Pro(2019) will not load some pages that has a login. Specifically ESPN fantasy (also couldnt get to ally.com at all with the same error) it says Safari (I also tried on Chrome) cant find the server. ESPN.com will load fine and I can see all tabs/videos but when I click on my fantasy team it just goes black with the error. My software is up to date, I reset modem/router to no avail. Probably been 6-8mos since I last accessed the page on my MacBook. I can login to the app on my phone so its not an account issue but there are certain things that must be done on the website. Any ideas? tia