indexnow server error

I'm getting server errors on one site and not the other. Something I'm missing in the setup?

• ErrorException: IndexNow error: [500] An unexpected error occurred. Please try again later.
• src/XF/Error.php:82

Stack trace

#0 src/XF.php(266): XF\Error->logError('IndexNow error:...', false)
#1 src/XF/IndexNow/Api.php(86): XF::logError('IndexNow error:...')
#2 src/XF/IndexNow/Api.php(34)...

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