OK, I created a second patreon regular account (and not a creator account) with a different email adress to my wordpress account (I suspected that might conflict was not sure)
Now it does work and does not throw the string error. (only when I am logged in as my creator account on patreon it throws the error)
The “login as patreon button” on the wp/admin login logs me now in to the site as a patreon “SUBSCRIBER” using my second account (it doesnt let me choose which account to log in with) I still dont know why I could not log in with my creator account. It created a subscriber account and unlocks the post on the right pledge amount and keeps the higher pledges locked.
As the SUBSCRIBER account created a user to my site it gave a default admin bar on top of my site to that user (which I had to use a plugin for to disable that for subscribers) this was annoying. Disabling the bar then gave me no method anymore to log of the subscriber unless I went to wp/admin url and so got the bar manualy.
The sign up for patreon widget buttons are still on my site as a subscriber. (it would be cool if it was detected that a patreon subscriber logged in and then this removed the sign up widgest)
The trick is now to create a login button for existing patreon users on the website (and not on the wp/admin backend as useless there. A “Patreon log on button” With a hidden admin bar It should give a link to the admin pannel or even better a “patreon log of button”
The patreon plugin should be able to toggle off the admin bar for subscribers completely without the use of another plugin to do that.
It should detect if a patreon user is logged in and then thus remove the widgets to get people to sign up for patreon or give another special “pledge more” option for existing logged in subscribers.
Hoping for your feedback.