Cannot get Plex sever (Synology 920+) to maintain remote access

I just set up a synology server (DS920+) and am having trouble getting Plex to allow remote access consistently. I was successfully sending plex streams out of the house from the server on my PC, but the synology one is giving me fits.

I can get it to give me the green " Fully accessible outside your network" message for a few minutes and can even stream from outside the network temporarily, but then it turns red and I lose access. I have tried everything in all of the trouble shooting guides.
Another weird quirk is that when i access it remotely, I can view all the files and the meta data is there, but it won’t play the videos. Says -“An error has occurred Please check your connection and try again”

For reference the server is hard wired into my ATT router, I have google wifi, but assume double NAT isn’t an issue because I am not going through wifi at all.

-Manually specified port 32400

-Set up port forwarding on the router for the server with global port range set 32400-32400 and base host port to 32400

-Turned off all firewalls on Synology/ created rules allowing port 32400

-Totally unplugged google wifi as a hail mary

So far, nothing. It is frustrating, because it is working slightly but then just stops. Has anyone else had a similar issue? I am not tech savvy enough to figure this out.

Do you have these ports open in firewall What network ports do I need to allow through my firewall? | Plex Support

I did that on the synology firewall and even turned the firewall totally off. No luck.

I have done basically that. The AT&T router doesn’t have quite that format for port forwarding they have
Service Name- Just put plex here
Global port range- 32400-32400
Base Host Port- 32400
Protocol TCP
Then from there I assign it to a machine.
As far as I could tell there was no reason i couldn’t assign 32400 for both the internal and external port. Only thing that throws me is the range.

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