If receiving the below error when attempting to sync Quotes from Quoter to Zoho:
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​Client error: POST https://www.zohoapis.com/crm/v2/Deals resulted in a 400 Bad Request response: {"code":"INVALID_MODULE","details":{},"message":"the module name given seems to be invalid","status":"error"} 

The likely cause is that the Module has been hidden. In the above example, the Deals Module has been hidden which can be confirmed by navigating in Zoho to Customization > Modules and Files where Deals will be absent from the displayed Modules:

This can be rectified by clicking on Organize Modules to enable the hidden Module(s):

Clicking Save will now have the previously hidden Module successfully displayed in the Modules list:

Navigating back to Quoter to Settings > Integrations > Integrations Requests Status will either successfully show the pushed attempts or allow you to manually re-attempt the push request (provided it has not exceeded the maximum number of attempts):

Please contact Quoter Support if you continue to experience issues.