Hey Anna,
Still having trouble with this and my client was unhappy because adding his business page to Business Manager meant he could no longer see it on his profile page.
Hm, I think you have to explain properly to your client regarding this, this is something we can't be control, since Facebook updated their API, Facebook enforce who want to autopost to their content into their Facebook page, they required page owner to do this domain verification.
You can take a look this info from Facebook docs.
>> Domain Verification provides a way for you to claim ownership of your domain in Business Manager. This ownership allows you to control editing privileges of your links and other content to prevent misuse of your domain and to keep bad actors from spreading misinformation.
- Facebook docs (https://developers.facebook.com/docs/sharing/domain-verification)
Once you adding your Facebook page into Business page, your client still can able to access this from your profile, he just need to click on the business manager link from the profile dropdown (screenshot :
http://take.ms/zKUyR ), Facebook just created a new platform for allow those page owner can manage their page easier.
I'm still getting this error when trying to connect his Facebook account to Easyblog:
URL blocked: This redirect failed because the redirect URI is not white-listed in the app's client OAuth settings. Make sure that the client and web OAuth logins are on and add all your app domains as valid OAuth redirect URIs.
Can you please provide us at least your current Facebook app configuration screenshot so I can better have a check which part configured wrongly since your client do not want to share his Facebook login details to us, that is really difficult for us to know where went wrong, we would love to help but if without any access we couldn't really know where went wrong.
Keep us update once you updated your Facebook app configuration screenshot and share with us which domain name URL you trying to access and click on that "Sign in via Facebook", this is the important step.