Note that some stuff under "szy" (Sakizaya) may actually belong under "ami" (Amis), as discussed at m:Requests for new languages/Wikipedia Sakizaya#January 2019 update. I guess this complicates the issue and means that things cannot simply be moved wholesale, as I suggested. But "ais" has been deprecated, so clearly something needs to be done here. I will leave it to others to determine what that is.
Note that we currently have no translators listed at Portal:szy and that language has not been enabled for translation, but at least one of the translators listed at Portal:ais appears to be among the users asking for a Sakizaya Wikipedia, so maybe they can help? (I've notified a few such users about this thread.)
Also note phab:T174601, which is discussing the same issue from a different perspective (Wikimedia wiki configuration).
Edit: As pointed out by StevenJ81 below, I actually meant to say: "Note that some stuff under 'ais'… may actually belong under 'ami'". Sorry for any confusion this may have caused.
Hi @Dcljr: I'm sure there are no stuff or content under "szy" belong under "ami". So how can we do to move all translations listed at Portal:ais to Portal:szy? We thought it would be moved just like the case with incubator:Wp/ais to incubator:Wp/szy. @Amire80: @StevenJ81: Is it possible to fix this problem? If negative, should we improve the portal one by one manually? Corainn (talk) 08:37, 18 July 2019 (UTC)
Look, it just sometimes takes time to sort some of these things out. I wouldn't worry a lot. @Corainn, if you are quite sure that nothing currently within language ais is actually Amis, then we could outright move everything from ais to szy. Otherwise, the thing to do is to copy everything from ais to szy, and worry about the disposition of ais later.
@Amire80, I can assure you that (a) szy is appropriate for Sakizaya, (b) pretty much everything that had been put previously into ais is really Sakizaya (I'll find the rather robust discussion history if you like), and (c) ais for "Nataoran" has been deprecated in favor of including Nataoran within the rest of Amis (ami). So please help us move this along. Thanks.
@StevenJ81: Great to hear that and thanks for the reply! Yes, there are no overlaps between amis and szy(ais), I‘m very sure. If something could be done by our side, please let me know.