No plans are available for the selected subscription

Team, justinroyal​  and boblarkin​ 

We just experienced the very issue being discussed in this mail thread.  The error message that there are 'no plans available for the selected subscription' in our instance was related to the actual subscription being selected during the private offer purchase step. For the specific subscription selected, the user got the error message and was unable to move forward.

When our customer changed subscriptions within the Purchase flyout dialog, they did not see the error which led us to look closer at the offending subscription itself.  In this case, it turned out the subscription was of an Offer that is not eligible for third party purchasing, Sponsorship (0136P).  Subscriptions of this Offer type are not in scope as they are not attached to a plan for billing purposes. Here is the link that spells out what is included AND excluded when a subscription is a 0136P Offer.  Azure EA Sponsorship Offer | Microsoft Azure

Some other Subscription Offer types where Marketplace purchasing is not possible include Free Trial (0044P), Microsoft Azure Sponsored Offer (0036P), Azure Pass Sponsorship (0243P).  The list of available Azure Offers is here.  Offer Details | Microsoft Azure

It is important to note EA subscriptions ARE available but are not in the above list. Their offer types are 0017P and 0148P. 

We were able to help mitigate this by selecting a different subscription to benefit from the free azure usage. This in turn, unblocked the desired subscription to complete the marketplace purchase.  We were able to troubleshoot this using the internal support tool which provides insight into the Offer Numbers for a given subscription.