Failure in ee/browser_ui/2_plan/issue_boards/project_issue_boards_spec.rb | Plan Project issue boards Assignee issue board shows the just created board with an assignee list, and an issue on it

Summary

Failing in Production/Canary https://ops.gitlab.net/gitlab-org/quality/canary/-/jobs/5245333

The API call to add members to the project is failing.

Stack trace

Failures:
  1) Plan Project issue boards Assignee issue board shows the just created board with an assignee list, and an issue on it
     Failure/Error: project.add_member(@user)
     
     QA::Support::Repeater::RetriesExceededError:
       Retry condition not met after 3 attempts
     # ./qa/support/repeater.rb:64:in `repeat_until'
     # ./qa/support/retrier.rb:42:in `retry_until'
     # ./qa/resource/members.rb:11:in `add_member'
     # ./qa/specs/features/ee/browser_ui/2_plan/issue_boards/project_issue_boards_spec.rb:70:in `block (4 levels) in <module:QA>'
     # /usr/local/bundle/gems/rspec-retry-0.6.1/lib/rspec/retry.rb:123:in `block in run'
     # /usr/local/bundle/gems/rspec-retry-0.6.1/lib/rspec/retry.rb:110:in `loop'
     # /usr/local/bundle/gems/rspec-retry-0.6.1/lib/rspec/retry.rb:110:in `run'
     # /usr/local/bundle/gems/rspec-retry-0.6.1/lib/rspec_ext/rspec_ext.rb:12:in `run_with_retry'
     # ./spec/spec_helper.rb:92:in `block (2 levels) in <top (required)>'
     # /usr/local/bundle/gems/rspec-retry-0.6.1/lib/rspec/retry.rb:123:in `block in run'
     # /usr/local/bundle/gems/rspec-retry-0.6.1/lib/rspec/retry.rb:110:in `loop'
     # /usr/local/bundle/gems/rspec-retry-0.6.1/lib/rspec/retry.rb:110:in `run'
     # /usr/local/bundle/gems/rspec-retry-0.6.1/lib/rspec_ext/rspec_ext.rb:12:in `run_with_retry'
     # /usr/local/bundle/gems/rspec-retry-0.6.1/lib/rspec/retry.rb:37:in `block (2 levels) in setup'
     # ./qa/specs/runner.rb:74:in `perform'
     # ./qa/scenario/template.rb:10:in `block in perform'
     # ./qa/scenario/template.rb:8:in `tap'
     # ./qa/scenario/template.rb:8:in `perform'
     # ./qa/scenario/template.rb:44:in `perform'
     # ./qa/scenario/template.rb:10:in `block in perform'
     # ./qa/scenario/template.rb:8:in `tap'
     # ./qa/scenario/template.rb:8:in `perform'
     # ./qa/scenario/bootable.rb:44:in `launch!'

Screenshot / HTML page

Not helpful - the failure appears to be occurring in an API call, so no meaningful interaction has occurred in the browser yet.