Why is SHC apply bundle failing?

Deployment Architecture

Hello, when we are trying to push our app bundle, the following error message occurs:

splunk apply shcluster-bundle --answer-yes -target https://HOSTNAME123:8089

Error while deploying apps to first member, aborting apps deployment to all members: 
Error while updating app=specificappname on target=https://XXXXXXXXX:8089: 
Non-200/201 status_code=500; {"messages":[{"type":"ERROR","text":"Read Timeout"}]

We checked the folder structure of "specificappname" on the deployer and on the shcnodes and couldn't find anything unusual.

The Deployment is automated via a script and was running successful before.

There are also no replication errors on the shc.

Any chance to debug this problem or find out what exactly is failing?

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