Web Filters

Has any one run into an issue with Microsoft authorisation on a Mac tethered/hot-spot to my phone (with a Smarty plan)?

Due to OpenReach being rubbish and cancelling my previous broadband installation several times, I've been using this setup at home for about 6 weeks.

This morning however none of the MS apps would authorise:  login.microsoftonline.com errors (with a TLS alert 49). Other sites (login.windows.net) return a 302 - not a TLS error.

My Phone works fine, just my tethered Mac. I turned on Cloudflares 1.1.1.1 Warp VPN thingy on the phone, and the Mac started working fine.

Of all the sites/app I visit that the MS authentication was the only one broken for me.

I can only assume Three (possibly Smarty, but doubtful) has broken it somehow, presumably some webfilter, which it can't apply when using a VPN.

Anyway, if you have this problem then perhaps try using a VPN on a phone (took ages to work this out!).