This article will discuss one of the reason why the rate plan might be unavailable on MyBookings.
First of all, make sure to check all restrictions that might affect rate plan display such as MinLos, Cut Off policy etc.
If everything is setup correctly but the rate plan is still unavailable, please, check the Reservation Sources.
The website as a source should always be enabled if you'd like your rate plan to be displayed on your website.
Once the source is active, go to the rate plan and add this source to it. Save the changes.
Once it's done the rate plan/promotion will appear on MyBookings.