Google Maps API not working - throws up a bunch of Javascript errors:

Loading the Google Maps JavaScript API without a callback is not supported: https://developers.google.com/maps/documentation/javascript/url-params#required_parameters js:207:316
Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://maps.googleapis.com/maps/api/mapsjs/gen_204?csp_test=true. (Reason: CORS request did not succeed). Status code: (null).

Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://psa.rejuvenate.it/api/chatprofile/bc60059e-8e68-4694-8d4f-4137b238a93b?key=4cfaa0f2-8915-4461-91ab-7df9366cc0ad&check_available=true. (Reason: CORS header ‘Access-Control-Allow-Origin’ missing). Status code: 405.

Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://psa.rejuvenate.it/api/chatprofile/bc60059e-8e68-4694-8d4f-4137b238a93b?key=4cfaa0f2-8915-4461-91ab-7df9366cc0ad&check_available=true. (Reason: CORS request did not succeed). Status code: (null).

TypeError: NetworkError when attempting to fetch resource. index.js:9:165453

Google Maps JavaScript API error: ApiNotActivatedMapError
https://developers.google.com/maps/documentation/javascript/error-messages#api-not-activated-map-error

Same problem here. 

Using own API-Key

#### Console ####

JQMIGRATE: Migrate is installed, version 3.4.0
jquery.min.js?ver=3.6.3:2

 jQuery.Deferred exception: google is not defined ReferenceError: google is not defined

    at buildMap (###/themes/cesis/js/cesis_custom.js?ver=6.2:420:25)
    at HTMLDivElement. (###/themes/cesis/js/cesis_custom.js?ver=6.2:495:15)
    at HTMLDivElement. (###/a524befefb716a3cdc0d39fb9f206884.js?ver=ba4c5d5f206f571c16ef587f307bc704:1:1223)
    at Function.each (###/wp-includes/js/jquery/jquery.min.js?ver=3.6.3:2:3003)
    at t.each (###/a524befefb716a3cdc0d39fb9f206884.js?ver=ba4c5d5f206f571c16ef587f307bc704:1:1088)
    at e..each (###/wp-includes/js/jquery/jquery.min.js?ver=3.6.3:2:1481)
    at window.cesis_gmaps (###/themes/cesis/js/cesis_custom.js?ver=6.2:488:30)
    at HTMLDocument. (###/themes/cesis/js/cesis_custom.js?ver=6.2:33:5)
    at e (###/wp-includes/js/jquery/jquery.min.js?ver=3.6.3:2:30158)
    at t (###/wp-includes/js/jquery/jquery.min.js?ver=3.6.3:2:30460) undefined
S.Deferred.exceptionHook @ jquery.min.js?ver=3.6.3:2
t @ jquery.min.js?ver=3.6.3:2
setTimeout (async)
(anonym) @ jquery.min.js?ver=3.6.3:2
c @ jquery.min.js?ver=3.6.3:2
fireWith @ jquery.min.js?ver=3.6.3:2
fire @ jquery.min.js?ver=3.6.3:2
c @ jquery.min.js?ver=3.6.3:2
fireWith @ jquery.min.js?ver=3.6.3:2
ready @ jquery.min.js?ver=3.6.3:2
$ @ jquery.min.js?ver=3.6.3:2
jquery.min.js?ver=3.6.3:2 

Uncaught ReferenceError: google is not defined
    at buildMap (cesis_custom.js?ver=6.2:420:25)
    at HTMLDivElement.<anonymous> (cesis_custom.js?ver=6.2:495:15)
    at HTMLDivElement.<anonymous> (hijackJQueryEach.tsx:37:21)
    at Function.each (jquery.min.js?ver=3.6.3:2:3003)
    at t.each (hijackJQueryEach.tsx:31:50)
    at e.<computed>.each (jquery.min.js?ver=3.6.3:2:1481)
    at window.cesis_gmaps (cesis_custom.js?ver=6.2:488:30)
    at HTMLDocument.<anonymous> (cesis_custom.js?ver=6.2:33:5)
    at e (jquery.min.js?ver=3.6.3:2:30158)
    at t (jquery.min.js?ver=3.6.3:2:30460)
buildMap @ cesis_custom.js?ver=6.2:420
(anonym) @ cesis_custom.js?ver=6.2:495
(anonym) @ hijackJQueryEach.tsx:37
each @ jquery.min.js?ver=3.6.3:2
t.each @ hijackJQueryEach.tsx:31
each @ jquery.min.js?ver=3.6.3:2
window.cesis_gmaps @ cesis_custom.js?ver=6.2:488
(anonym) @ cesis_custom.js?ver=6.2:33
e @ jquery.min.js?ver=3.6.3:2
t @ jquery.min.js?ver=3.6.3:2
setTimeout (async)
S.readyException @ jquery.min.js?ver=3.6.3:2
(anonym) @ jquery.min.js?ver=3.6.3:2
e @ jquery.min.js?ver=3.6.3:2
t @ jquery.min.js?ver=3.6.3:2
setTimeout (async)
(anonym) @ jquery.min.js?ver=3.6.3:2
c @ jquery.min.js?ver=3.6.3:2
fireWith @ jquery.min.js?ver=3.6.3:2
fire @ jquery.min.js?ver=3.6.3:2
c @ jquery.min.js?ver=3.6.3:2
fireWith @ jquery.min.js?ver=3.6.3:2
t @ jquery.min.js?ver=3.6.3:2
setTimeout (async)
(anonym) @ jquery.min.js?ver=3.6.3:2
c @ jquery.min.js?ver=3.6.3:2
fireWith @ jquery.min.js?ver=3.6.3:2
fire @ jquery.min.js?ver=3.6.3:2
c @ jquery.min.js?ver=3.6.3:2
fireWith @ jquery.min.js?ver=3.6.3:2
ready @ jquery.min.js?ver=3.6.3:2
$ @ jquery.min.js?ver=3.6.3:2
js?key=####&ver=6.2:236 

Google Maps JavaScript API has been loaded directly without a callback. This is not supported and can lead to race conditions and suboptimal performance. For supported loading patterns please see https://goo.gle/js-api-loading