Check to see if you have read-write access.
The Git error message is misleading. I had a similar issue. I had been added to an existing project. I cloned it and committed a local change. I went to push and got the ERROR: Repository not found.
error message.
The person who added me to the project gave me read-only access to the repository. A change by them and I was able to push.
与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…