@KristjanESPERANTO
Sorry for the split message.
I have successfully tested:
http://magicmirrorip:8080/api/monitor/on
http://magicmirrorip:8080/api/monitor/off
http://magicmirrorip:8080/api/refresh
http://magicmirrorip:8080/api/reboot
http://magicmirrorip:8080/api/alert/showalert

@KristjanESPERANTO
That seems to have fixed my specific problem. Thank you!!!
I have tested:
http://magicmirror2:8080/api/monitor/on

@KristjanESPERANTO
I don’t get a failure, however the alert/showalert function does not work:

{"success":false,"message":"Module alert does not have any actions defined."}

@kristjanesperanto
It looks like something also happened to showalert:

http://magicmirrorip:8080/api/module/alert/showalert?message=Hello&timer=2000&apiKey=********-****-****-****-**********

TypeError: Cannot read properties of undefined (reading 'showalert')
    at Class.answerModuleApi (/home/bloodknot/MagicMirror/modules/MMM-Remote-Control/API/api.js:457:35)
    at /home/bloodknot/MagicMirror/modules/MMM-Remote-Control/API/api.js:296:14
    at Layer.handleRequest (/home/bloodknot/MagicMirror/modules/MMM-Remote-Control/node_modules/router/lib/layer.js:152:17)
    at next (/home/bloodknot/MagicMirror/modules/MMM-Remote-Control/node_modules/router/lib/route.js:157:13)
    at Route.dispatch (/home/bloodknot/MagicMirror/modules/MMM-Remote-Control/node_modules/router/lib/route.js:117:3)
    at handle (/home/bloodknot/MagicMirror/modules/MMM-Remote-Control/node_modules/router/index.js:435:11)
    at Layer.handleRequest (/home/bloodknot/MagicMirror/modules/MMM-Remote-Control/node_modules/router/lib/layer.js:152:17)
    at /home/bloodknot/MagicMirror/modules/MMM-Remote-Control/node_modules/router/index.js:295:15
    at param (/home/bloodknot/MagicMirror/modules/MMM-Remote-Control/node_modules/router/index.js:600:14)
    at param (/home/bloodknot/MagicMirror/modules/MMM-Remote-Control/node_modules/router/index.js:610:14)
    at param (/home/bloodknot/MagicMirror/modules/MMM-Remote-Control/node_modules/router/index.js:610:14)
    at processParams (/home/bloodknot/MagicMirror/modules/MMM-Remote-Control/node_modules/router/index.js:664:3)
    at next (/home/bloodknot/MagicMirror/modules/MMM-Remote-Control/node_modules/router/index.js:291:5)
    at /home/bloodknot/MagicMirror/modules/MMM-Remote-Control/API/api.js:148:7
    at Layer.handleRequest (/home/bloodknot/MagicMirror/modules/MMM-Remote-Control/node_modules/router/lib/layer.js:152:17)
    at trimPrefix (/home/bloodknot/MagicMirror/modules/MMM-Remote-Control/node_modules/router/index.js:342:13)

@KristjanESPERANTO
Update to 4.2.0 fixed the issue. Thanks for the quick response!!

@KristjanESPERANTO - Cannot GET /api/refresh (or any API call)
MMM-Remote-Control is working fine on the same computer that the API is not found. This occurred in the last couple of updates. Nothing else changed in the configuration and/or modules.

magicmirror2 = 192.168.4.21
http://magicmirror2:8080/remote.html#main-menu WORKS from 192.168.4.210
http://magicmirror2:8080/api/refresh Does NOT Work from 192.168.4.210

MM Config:
address: "0.0.0.0",
port: 8080
basePath: "/",
ipWhitelist:[],

module: 'MMM-Remote-Control',
config: {
	customCommand: {}
     	showModuleApiMenu: true,
     	secureEndpoints: true,
     	apiKey: '********-****-****-****-************'  
     	showQRCode: false

GET http://magicmirror2:8080/api/refresh?apiKey=********-****-****-****-************ 404 (Not Found)

What has changed? Did I miss an update? Any assistance will be great