猜测是因为权限不够被拒绝了，我就以管理员的账号登录查看该项目下A的角色权限，发现是Developer角色
接下来就是查看GitLab的官方文档，看不同的角色具体分配那些权限
GitLab中共定义了四种角色，每种角色各分配了不同的权限，如下表所示
我查找了Push to protected branches这一项，发现Developer是没有该权限的，所以导致无法push代码到远程仓库，只需项目所有者对该成员提权即可，重新邀请该成员，role permission选择Maintainer角色，如下图所示
ActionGuestReporterDeveloperMaintainerOwner
Download project✓ (1)✓✓✓✓
Leave comments✓ (1)✓✓✓✓
View Insights charts (ULTIMATE)✓✓✓✓✓
View approved/blacklisted licenses (ULTIMATE)✓ (1)✓✓✓✓
View License Compliance reports (ULTIMATE)✓ (1)✓✓✓✓
View Security reports (ULTIMATE)✓ (3)✓✓✓✓
View Dependency list (ULTIMATE)✓ (1)✓✓✓✓
View License list (ULTIMATE)✓ (1)✓✓✓✓
View licenses in Dependency list (ULTIMATE)✓ (1)✓✓✓✓
View Design Management pages (PREMIUM)✓✓✓✓✓
View project code✓ (1)✓✓✓✓
Pull project code✓ (1)✓✓✓✓
View GitLab Pages protected by access control✓✓✓✓✓
View wiki pages✓✓✓✓✓
See a list of jobs✓ (3)✓✓✓✓
See a job log✓ (3)✓✓✓✓
Download and browse job artifacts✓ (3)✓✓✓✓
Create new issue✓ (1)✓✓✓✓
See related issues✓✓✓✓✓
Create confidential issue✓ (1)✓✓✓✓
View confidential issues(2)✓✓✓✓
Assign issues
✓✓✓✓
Label issues
✓✓✓✓
Set issue weight
✓✓✓✓
Lock issue threads
✓✓✓✓
Manage issue tracker
✓✓✓✓
Manage related issues (STARTER)
✓✓✓✓
Manage labels
✓✓✓✓
Create code snippets
✓✓✓✓
See a commit status
✓✓✓✓
See a container registry
✓✓✓✓
See environments
✓✓✓✓
See a list of merge requests
✓✓✓✓
View project statistics
✓✓✓✓
View Error Tracking list
✓✓✓✓
Pull from Conan repository, Maven repository, or NPM registry (PREMIUM)
✓✓✓✓
Publish to Conan repository, Maven repository, or NPM registry (PREMIUM)
✓✓✓
Upload Design Management files (PREMIUM)
✓✓✓
Create new branches
✓✓✓
Push to non-protected branches
✓✓✓
Force push to non-protected branches
✓✓✓
Remove non-protected branches
✓✓✓
Create new merge request
✓✓✓✓
Assign merge requests
✓✓✓
Label merge requests
✓✓✓
Lock merge request threads
✓✓✓
Manage/Accept merge requests
✓✓✓
Create new environments
✓✓✓
Stop environments
✓✓✓
Add tags
✓✓✓
Cancel and retry jobs
✓✓✓
Create or update commit status
✓✓✓
Update a container registry
✓✓✓
Remove a container registry image
✓✓✓
Create/edit/delete project milestones
✓✓✓
Use security dashboard (ULTIMATE)
✓✓✓
View vulnerabilities in Dependency list (ULTIMATE)
✓✓✓
Create issue from vulnerability (ULTIMATE)
✓✓✓
Dismiss vulnerability (ULTIMATE)
✓✓✓
Apply code change suggestions
✓✓✓
Create and edit wiki pages
✓✓✓
Rewrite/remove Git tags
✓✓✓
Manage Feature Flags (PREMIUM)
✓✓✓
Use environment terminals
✓✓
Run Web IDE's Interactive Web Terminals (ULTIMATE ONLY)
✓✓
Add new team members
✓✓
Enable/disable branch protection
✓✓
Push to protected branches
✓✓
Turn on/off protected branch push for devs
✓✓
Enable/disable tag protections
✓✓
Edit project
✓✓
Add deploy keys to project
✓✓
Configure project hooks
✓✓
Manage Runners
✓✓
Manage job triggers
✓✓
Manage variables
✓✓
Manage GitLab Pages
✓✓
Manage GitLab Pages domains and certificates
✓✓
Remove GitLab Pages
✓✓
Manage clusters
✓✓
View Pods logs (ULTIMATE)
✓✓
Manage license policy (ULTIMATE)
✓✓
Edit comments (posted by any user)
✓✓
Manage Error Tracking
✓✓
Delete wiki pages
✓✓
View project Audit Events
✓✓
Manage push rules
✓✓
Switch visibility level
✓
Transfer project to another namespace
✓
Remove project
✓
Delete issues
✓
Disable notification emails
✓
Force push to protected branches (4)
Remove protected branches (4)
另一种方式就是将该分之保护移除
