Client nextcloud don't want allow acces

Hello, in first I’m sorry, I’m french and don’t speak very well English. I’ m new on the forum.
I have a problem wit my client sync nextcloud. I have installed it o a mac mini OS catalina 10.15.7 and the version client is 3.0.2. When I try to connect it on my server Nextcloud, the identification is ok, but when i must allow the access from the browser, i click and nothing pass. One idea ?