Why should this work?
In most cases it is okay logging into the TYPO3 backend using the main base URL. But there are cases, where this can lead to problems.
When using the page type Backend User Section and having multiple languages with different domains, this can be problematic. When calling a translated Backend user section, the system uses the corresponding site language base URL for preview. But there is no valid backend login for this domain so an editor can preview a translated Backend User Section. The editor needs to login to the TYPO3 backend using the base URL from the alternative site language.
Right now, it is not possible to login from a domain that is configured as a base for an alternative site language.
Extension version: 3.6.0 TYPO3 version: 10.4.23 PHP version: 7.4
Steps to reproduce:
Why should this work? In most cases it is okay logging into the TYPO3 backend using the main base URL. But there are cases, where this can lead to problems. When using the page type Backend User Section and having multiple languages with different domains, this can be problematic. When calling a translated Backend user section, the system uses the corresponding site language base URL for preview. But there is no valid backend login for this domain so an editor can preview a translated Backend User Section. The editor needs to login to the TYPO3 backend using the base URL from the alternative site language.