Can't access UI

Total Noob here..trying to setup Immich first time using QNAP NAS (QUTS Hero) using Portainer. I deployed stack from the application template in Portainer. All containers are running but when I go to the UI I get:
getaddrinfo ENOTFOUND immich-server (ENOTFOUND)
Stacktrace
Error: getaddrinfo ENOTFOUND immich-server
at GetAddrInfoReqWrap.onlookupall [as oncomplete] (node:dns:118:26)

Yaml file is attached.
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