All users are receiving the message banner with generic error: undefined
This is caused by an invalid identifier.
In one reported case, the following error appears in the APP log:
ERROR 2021-07-09 14:23:25,913 [https-jsse-nio2-8443-exec-716] ppm.rest (clarity:admin:session:PPM_REST_API) {"attributeCode":"company_logo","resourceId":1,"versionId":5013510,"resourceName":"odf_brand","fileId":5013509}
which indicates an issue with loading a logo.
Set the company logo in the Modern UX > Administration Module > Settings > Branding > Header Logo
which is the <server>/pm/#/admin/settings/branding page
Click button(Upload New Logo) to reset the logo.