Latitude7973 parent
This completely stymied me - joining a meeting while WFH: broadband goes down, can't use the SIM in my computer, can't tether to my phone as they are all using Vodafone.
I could tether to my (non Vodafone) phone, but my work laptop refused to connect to the WiFi hotspot until I physically unplugged the ethernet cable from the dock. "You can't connect to another network while you're on your employer's network." I'm not!
That's one of the reasons I kept my Irish SIM even after I got my Danish one. I've found it useful on plenty of occasions to switch to the other, especially when traveling.
I had a similar event a few months back, I now have separate providers for my SIM and home internet.
You pay more, but the redundancy is worth it imo