LDAP auth,using admin account to login,return http error 403

Gitlab uses ldap authentication, and suddenly logs in with the administrator account configured by ldap, the web page prompts that the request to access to the gitlab address is rejected, displaying http error 403;Ordinary users of ldap can log in normally. Ask you why the administrator account has such a phenomenon.
It is worth mentioning that the private token and access token under the ldap administrator account are called in many places. I don’t know if it is related to this.
I have checked the ip whitelist and ldap lock and have not found the cause of the problem;

Web display:
The request to access xxx was denied
You are not authorized to view this page

log display:
Processing by Projects::MergeRequestsController#show as JSON
Parameters: {“namespace_id”=>“KK-SECURITY-BACKEND”, “project_id”=>“SecOMP”, “id”=>“328”}
Started GET “/” for xxx.xxx.xxx.xxx at 2020-09-02 15:03:48 +0800
Processing by RootController#index as HTML
Completed 403 Forbidden in 3ms (ActiveRecord: 0.2ms)
Completed 200 OK in 98ms (Views: 1.1ms | ActiveRecord: 8.6ms)