HTTP Error 403 on using API

Hi,

I have recently install Gitlab Omnibus (v13.7.4) but I have integrated it with Snyk, however as soon as I start importing projects via API, it starts throwing error 403 and blocks my account access and the only way to restore it is to flush the Redis-DB which terminates my current sessions as well, can someone suggest me on how I can debug and fix this issue?