Hi @Darshil_Shah1 thanks for the response.
On the total sandbox refresh, we reached out to the support and all is well with Sandbox as we connected it by again creating the Connected App in Salesforce and used the Consumer Key and Secret to update the same in MKTO and re-establish the sync.
However, our Salesforce Admin couldn't find the Connected App that's created in Production instance. All being said, the connection is seamless with the Production instances. The only concern for SF team is they couldn't find the Connected App and they raised the support request with SF and they came back with this answer " " Please note, If a connected app is part of managed package and if we want to see it in the org then we should install that app. Also, if the connected app is part of a managed package then we can not access the consumer key and secret of that app. It is working as designed."
Wondering if there is another way that our SF team would have connected MKTO other than OAuth. ( Even though our instance show 'Edit OAuth settings" in Admin>Salesforce.
I will ask to check our SF team again with their support
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