YouTube Channel: kyokushin1988

Error type: "Bad Request". Error message: "Bad Request" Domain: "usageLimits". Reason: "keyInvalid".

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Check in YouTube if the id kyokushin1988 belongs to a username. Check the FAQ of the plugin or send error messages to support.

YouTube Channel: kyokushinBlackForest

Error type: "Bad Request". Error message: "Bad Request" Domain: "usageLimits". Reason: "keyInvalid".

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Check in YouTube if the id kyokushinBlackForest belongs to a username. Check the FAQ of the plugin or send error messages to support.

YouTube Channel: KyokushinkanGermany

Error type: "Bad Request". Error message: "Bad Request" Domain: "usageLimits". Reason: "keyInvalid".

Did you added your own Google API key? Look at the help.

Check in YouTube if the id KyokushinkanGermany belongs to a username. Check the FAQ of the plugin or send error messages to support.