got the WAP371-A-K9 about a year ago and expended the network to 3 more WAP371-E-K9 (couldnt find anywhere the A-k9....)
the representative confirmed that they can be clustered together. but so far i can cluster the 3 "E"s without the A one....
Running the latest version of firmware, and it was the same case with the old firmware versions too (just recently found that Community....).
All Connected by SG350X-24MP over PoE...
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