iPhone 17 Pro Max ESIM activation issues

Sounds like bunk. If you've been with Cox for over a year, Verizon doesn't enter into the equation any more.

Unfortunately, using a discount MVNO means you get discount service and support.

Switching carriers now will likely mean additional headaches porting your number to a new carrier. IF you decide to go that route, I recommend not going with an MVNO. Stick with one of the big 3. Will it cost more? Yes. Are you likely to experience the kinds of problems you will with an MVNO? It's not as likely (not impossible, but not as likely).

"iPhone 17 Pro Max ESIM activation issues: [...]It was only when they tried to switch it over Everything went crap was wondering if this is really an ongoing issue because they tell me I’m not the only one or is this Cox‘s problem and I need to look into switching carriers. Any advice would be greatly appreciated thanks"

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Fixing ESIM Card Activation:

Your Carriers (Verizon and Cox) don't like each other's option, being adversaries/opponents in the same industry (Cellular service provider). However, your Carrier is the one who configures your device. So, you'll have keep keep going through your Carrier.

This Google Search Query Provides a Couple of Telling Tips: going from verizon to cox

As it Reads: "To switch from Verizon to Cox, do not cancel your Verizon account early; keep it open to transfer your number and receive a final bill." and "do not cancel your Verizon account early; keep it open to transfer your number and receive a final bill"

They can run diagnostics. Apple trained the techs that will be working on your device. It’s not the regular Geek Squad techs.