You'll probably need to provide more information for anyone to be able to help you. "pre-receive hook declined" means there is some hook (possibly from a BBS plugin, possibly a hook from core) that has explicitly decided your push is not allowed. It's pretty generic and doesn't tell us which one prevented it or why. The hooks usually print a message to the Git client with a reason.
The message in the Git client should generally include more information, but worst case you might want to look at your server logs to see if there is anything logged when this happens.
If you can't find help here, I'd suggest heading to https://support.atlassian.com and asking our Support Engineers for assistance. They will ask you to generate a Support Zip of your instance (logs and configuration information) and will be able to diagnose the problem a bit better with that info.
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