For your PC, you have two options:
- Use the Apple TV app, as downloadable from the Microsoft App Store.
- Use a web browser to access tv.apple.com. Apple suggests to use Firefox or Chrome.
In the Apple TV app or Apple TV+ site, after sign-in, navigate to the MLS tab to access MLS Season Pass content.
Watch MLS Season Pass on the Apple TV app - Apple Support
If browser access doesn’t work immediately, try deleting browser cache files and try deleting website data (cookies) for the apple.com domain, from within the browser settings. Then try again.
If the issue persists after all that, then consider contacting the Apple Support staff for further assistance. Contact Apple for support and service (phone numbers) or start your support request online (chat/email/callback).