As a less-than-ideal workaround, here is a way to figure out which AP's are mapped to which FlexConnect groups:
SnmpWalk cLReapGroupApConfigTable (.1.3.6.1.4.1.9.9.517.1.3.2.1) and look at each different instance of cLReapGroupApRowStatus (.1.3.6.1.4.1.9.9.517.1.3.2.1.2) who's value is 1 (active). The OIDs returned by the Walk should be indexed as follows. cLReapGroupApRowStatus.x.x.x.x... where the number of different decimal places is variable. The index is two parts, the first part is the FlexConnect group name, and the second is the AP's MAC address.
The group name as an index is structured such that the first decimal place (x) indicates how many characters are in the name, then the next x decimal places are decimal representations of the ASCII characters of the name. For example, if a group name is "fcgroup1" the first 9 decimal places following cLReapGroupApRowStatus will be ".8.102.99.103.114.111.117.112.49". The first place "8" because there are 8 characters in the name, then 102 = f, 99 = c, etc.
The second part of the index (the last 6 decimal places) is the MAC address converted to decimal. For example, given the MAC address of AB:CD:EF:12:34:56 the last part of the index would be ".171.205.239.18.52.86". 171 = AB, 205 = CD, etc.
Putting it all together, if the previous AP MAC is the only AP on the controller and the group is the only group, then the SnmpWalk results of cLReapGroupApConfigTable should contain at least the following two entries
.1.3.6.1.4.1.9.9.517.1.3.2.1.1.8.102.99.103.114.111.117.112.49.171.205.239.18.52.86 = 4 (cLReapGroupApStorageType = permanent)
.1.3.6.1.4.1.9.9.517.1.3.2.1.2.8.102.99.103.114.111.117.112.49.171.205.239.18.52.86 = 1
(cLReapGroupApRowStatus = active)
