I also had issues - First time as well there was an issue 😳😳Verizon has always been on it especially on their app
App came up quickly but I was never able to get the 17 pro max in my cart - it was giving fetch errors on the app, moved to online no dice there either with multiple attempts, called vz and was on hold as expected.
Switch over to Apple and they reserved a phone because Verizon systems were not responding 😳
Fired up my work laptop and I was able to get thru but then my PayPal payment wouldn’t go thru, bill to the account wasn’t an option, so finally I used my credit card and it worked.
I still have launch day delivery so I’m good. Meanwhile my sister who has ATT was able to put her order in her cart earlier today and preorder in 30 seconds 😞