My photos in the iCloud new shared album can’t be seen

I have some shared albums with few people. I created a new one the last week (with 50 pics) and shared with 2 people. They received the email notification but they can’t see anything. I have previously shared pictures to them before without any issue. I didn’t change any setting, they only thing different compared to before, it’s that I increased the storage space in iCloud and updated to the last IOS. I don’t want to disable and then enable the iCloud photo sharing because I will loose my albums. One of the persons who I was sharing the pictures before already did this and now he can’t see The pictures from the albums he could see befote disabling-enabling this option, i did resent the invite to access the album. He received the invite but the album is empty for him.

I already restarted my iphone several times and my wifi is working fine so I don’t see the mistake of the iCloud, I still have 150GB free.