Mikrotik as router to Cisco ASA

Hello,
I want to use a Mikrotik RouterBoard as router with ether1 as WAN and ether4 as LAN.
The basic configuration of a router is done (set IPs, DNS, Gateway, NAT/masquerade,..).
Now I do Have Internet if I plug a PC in ether4.
I do have an instatlled Cisco ASA taking from a router and everything is working fine after the ASA.
The problem is if I plug the Cisco ASA Firewall in ether4 in the RouterBoard, there is no internet after the ASA. i looked in IP scan and ARP there is no sign that the ASA is connected to the Mikrotik. All I can see that ether 4 in interfaces have the port up 1Gbps with no traffic at all.

How is ASA configured?
Is the port connected to ETH4 set to obtain IP from DHCP or is statically configured?

it is statically configured on ASA

So the question is: Is the configuration compatibile with MT settings for port 4? IP? Routes? DHCP?

I set ASA’s IP: 192.10.10.20/24 with 192.10.10.1 as GW.
in MT, I set ether4 IP 192.10.10.1/24

Do you have NAT for ETH4 or is it an element of a bridge so the IP settings + NAT should be done for bridge?

Reset router to default settings, set ASA to 192.168.88.20 and 192.168.88.1 as GW and check if it works.
If yes, then you made mistakes configuring MT.