Client Mode wpa2 passwort restrictions

RouterOS Beginner Basics
1

Hi,
i would like to use my new hap lite MikroTik Router as Client.
But i have problems with this mode.
With an easy short password, there are no problems and everithing works fine.
But with an 63 Charakter long complex password there is no connect possible. Is this an Bug or has MikroTik some restrictions?

In the password are signs like that: {l\ < +]!,%@ "3@ ]'`]
The Router OS is: 6.32.3
I use only WPA2 PSK aes ccm
error in log file is:
MAC@wlan1: failed to connect, on
2412/20/gn, authentication failed: unspecified (37)

Thanks for helping.
Alex

2

Can you connect to this AP using regular laptop/smartphone?
What AP you are using?

3

yes, i can connect with Smartphone / Notebook / IPad, …
The AP is a AVM Fritz Box 7490