If you have no live view feed, ''black screen'', no video but still have the telemetry, then it is more than likely you're phone/tablets processing power.
I have the Note 20 Ultra 5g, used it so many times with the Mini 2 with no issues whatsoever until yesterday. Mate and I went for an all you can eat Chinese, then did a flight, well, I tried to, I had the dreaded black live view, telemetry was working fine, just no video coming through, I restarted the AC, didn't work, restarted the controller, didn't work, restarted all 3, didn't work. Whilst my mate and i was chucking ideas back and forth, mostly him taking the plss out of mine not working mind, it clicked, as I knew I was going to be using my phone for the drone, later on, I'd stuck the phone into power-saving mode and, amongst other things, this dropped the CPU by 30%, so whilst the phone still had 70% CPU speed, it was obviously enough to cause issues with the live view feed.

So make sure you're not in power saving mode, make sure there are no apps running taking up valuable resources and make sure your devices is actually up to the task...

Just food for thought

Hello there Bashy. Thank you for reaching out and for sharing your experience with us with regards to this matter. Thank you and fly safe always.

Ow.... good to know...

When my screen went black the telemetry was also gone.
Since the cable worked fine all occasions afterwards, I now suspect the ligtning port to have been "dirty"? like someone had before on this forum.
(do have 2 spare cables by now too, lol)

Never have issues with my iPhone.

Never had this with iPhone either.

I didnt have an issue with mine either ;) it was user error

Hannibal_ Posted at 9-26 23:29
Ow.... good to know...

When my screen went black the telemetry was also gone.

Yeah, yours was a different issue, if there is telemetry still then that's gotta be down to the device's resources at max usage

Good to know and thanks for sharing Bashy.  

DowntownRDB Posted at 9-27 03:50
Good to know and thanks for sharing Bashy.

No worries and thanks

Bashy Posted at 9-27 04:03
No worries and thanks

You're welcome.  Have a great week.  

Now I want Chinese Food! Thanks.

scubaAnn Posted at 9-29 06:34
Now I want Chinese Food! Thanks.

Anytime lol

Never have had an iPhone!