Im using Zeus on my grapheneOS which is connected to my raspiblitz node.

I connected Zeus and my node via Lightning Terminals "Lightning Node Connect" (LNC).

Works much quicker than through LND (REST).

But back to your question. Yes it worked for me with LND (REST) as well.

But really strange that there is no response message wether something is wrong or not.

Try asking the Zeus team directly through their Telegram channel.

Hope you will get it running.