Had the same issue and was unable to find the nas with synology finder. The Tmobile router runs an ip of 192.168.12.1, but my synology was manually set to a 192.168.0.1 address from the previous router. I had to reconnect to the nas with a different router since Tmobile's router ip can't be changed. Set the nas to Tmobile's ip range of 192.168.12.x and save. Then when put back on the Tmobile router network it's discoverable.
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