Make sure you have 'BIM Server Libraries' reserved in the Library Manager.
You should see a button with an arrow on it above, next to the large 'ADD..." button. It will have an option saying 'Use BIM Server Library..."
Select the libraries you need to replace the offline libraries. That *should* fix it... I don't know what causes that problem but two computers here get it often.
AC 6-27 - Intel i9-9900K - RTX3090 - Windows 11 - 64GB RAM