Identifier does not work with proper ISBN

Hey folks,

I installed Zotero 5.0.87 yesterday and tried to use the identifier with different ISBN´s. Unfortunately, neither works. Here is one example which worked in the past: 978-3658262792. The following error occurs "Zotero could not find a record for the specified identifier. Please verify the identifier and try again.".

Any suggestion how to fix the problem?

Cheers,
Christian
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