Site2Site VPN established, but Firewall blocking traffic

Hello folks,

I have succesfully established an IPSec Tunnel between an Astaro UTM 9 and a Watchguard Firebox XTM v. 11.7
The config looks like this:

(local) 10.20.100.0/24=10.0.88.200 <=> (remote) 82.194.116.122=10.188.28.0/24

There seem to be two (probably different) problems here:

I can ping from local to remote, but not from remote to local.
When I try to ssh from local to remote, I can see the attempt being blocked by the firewall:

11:33:19 Default DROP TCP 10.20.100.144:33000 → 10.188.28.250:22 [SYN] len=60 ttl=64 tos=0x00 srcmac=0:50:56:8e:c:98

There is the default rule that should allow any traffic of type "Terminal Applications" from local networks to any destination, but this does not seem to apply.
I have tried rules additional rules in top position, that should allow this traffic to pass, but to no avail. I really hope someone out there can help me out.
Screenshots of the config are attached to this post.

Thanks to everybody.
playersons

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