Is there any way to link them or fix the issues?

Network situation: I need to build a w12 server environment. In that i have to build an app "reporting system". Now the teachers demand that i work with sql server and access. But i already worked with phpmyadmin. Now i have to search a way to link php with sql on the same server. For the microsoft access, i will just get a export of the database and then link it or so..

Also, right now i worked with xamp and in the apache config, i put the server ip. Now i try to access the app via a client but it doesn't work. When i change the localhost to an ip in wp config, it won't open in the client. I can access the port and see the directory but i can't open the folder with the app. I think the problem lies in the wp config but idk how to tackle that..

I worked with a vpn network from zerotier. And the client and server have communication (i pinged and got replies).

Any links/ideas?