I might be having this issue, too. It’s occurring at least when adding an existing user on the multisite to a subsite they are not on. Is the error message on Import users from a CSV file page? And says:
Some users were successfully imported but some were not, please check the error log.
The error log link opens to a 403 Forbidden message and says:
Access to this resource on the server is denied!
Please let me know if I should create a new thread.
WordPress version: 5.8.3
PHP version: 7.2.34
Occurring on multisite
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This reply was modified 2 years, 7 months ago by apwpec.