Glad to hear that you have got past the initial hurdle although I am still not sure why your problem occurred in the first place!
The OPDS standard does not limit the formats that can be included, although the reader device will be constrained in what it can handle. In calibre2opds you can specify what formats entries should be generated for on the Advanced Customisation tab. You can specify either a list of formats or ALL if you want every format in your library (although that might result in formats your reader cannot handle if you have them in your library). If there are multiple matches to that list you can also specify (optionally) that only a link for the earliest match should be generated.
If you find that you still cannot get AZW to show up let us know in case there is a bug in calibre2opds.
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