If the tickets are sold out at the venue and on ticket master do they accept tickets from other sites like vivid seats

I think it would depend on what form of ticket you have although as long ss you have something to present that hasnt been scanned yey you should be fine

I personally have never used vivid seats, but I have used the gametime app. I was able to get into this venue when the staff scanned the barcode ticket on my phone.

As long as it's a valid entry you shouldn't have a problem.

So look up gametime in app store