Hello ,
I solved my problem by migrating my rules node 8 to 12. Despite everything, I don’t know why it didn’t work suddenly, an intermediate certificate in node8 which was expired?
The only information I managed to gather that there were some certificate issues around weekend the prevented some people from calling their APIs. The API is what needs to have the certificate updated, because it / they has / have an expired certificate in the chain. In some cases users were able to fix it themselves in some cases we did that.