Broadcasting does not work

[jagottsicher]

Using Wordpress 5.5.3 and properly setup wp-weixin with the credentials of our (company's) Official Account.

I just setup three articles and combined them to a broadcast, which was published afterwards. A first quick test last week failed, but to day the broadcast was " broadcasted successfully" - according to the status message in wordpress, it never appeared in Wechat. For a second try the same. Both keep an empty log.

Can I check somewhere if the broadcast was refused? Need to check in WeChat-BAckend?