I'm not particularly familiar with how Garmin/Connect 'reads' the identity of the unit connected to it. It may be that it only looks at the unit's HWID and because yours is still 2204 it's being identified as an Explore and the assumption is made that those features aren't available. Read the comparison of full 1000 to Explore here:
If you want it to function fully as an Edge 1000 then do a complete conversion, it'll then have HWID of 1836 and the extra features should be available in GC.
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