Samsung Galaxy Tab S7+ not connecting anymore

I have two mobile device that I want to sync to my laptop using AcrutoSync:
One is a Samsung Galaxy Note 9 (running Android 10) and that works fine synching in both directions.
The other is a Samsung Galaxy Tab S7+ and that one – presumably since a recent OS upgrade – has seized to connect to AcrutoSync.
The odd thing is: I have a separate “Tasks and Notes” application running on that same table, which has its own connection setup and that works OK. So, my tasks and notes are syncing fine. So, obviously the connectivity is not the issue here.
For my contacts and calendar, however, I need to create an “account” on the OS level and that’s the one that doesn’t work anymore.
For that I am – like with my Note 9 – trying to establish a “Microsoft Exchange ActiveSync” account in “Settings” under “Accounts and backup” using the same server, username and password as with the other device.
The failure that I then always get is a terse “Couldn’t verify account” error message.

I am running AcrutoSync v5.2.52 on Windows 10 22H2 (with all available updates and patches installed). My Outlook reports as “Microsoft® Outlook® 2016 MSO (Version 2210 Build 16.0.15726.20188) 32-bit”.
The Tablet’s “About”-dialog states “Android 13” with patch level “Nov. 1, 2022”.

Any idea how to get this connection working again? Do I need to create some special “acceptable” server certificate or something of that sort?