They are using Availability Check (Version 1.7.0 w/ a valid license) and Easy Booking (Version 3.0.3). The strange thing is that this was working perfectly on the server we took the export from.
This is the console error that comes up as soon as we attempt to run the availability report.
VM404:1 POST https://shop.gammie.com/wp/wp-admin/admin-ajax.php 403
(anonymous) @ VM404:1
send @ load-scripts.php?c=0&load[chunk_0]=jquery-core,jquery-migrate,utils,jquery-ui-core,jquery-ui-datepicker,jquery-ui-mouse,jquery-ui-sortable,moxiejs,plupload&ver=5.7.2:2
ajax @ load-scripts.php?c=0&load[chunk_0]=jquery-core,jquery-migrate,utils,jquery-ui-core,jquery-ui-datepicker,jquery-ui-mouse,jquery-ui-sortable,moxiejs,plupload&ver=5.7.2:2
s.ajax.s.ajax @ load-scripts.php?c=0&load[chunk_0]=jquery-core,jquery-migrate,utils,jquery-ui-core,jquery-ui-datepicker,jquery-ui-mouse,jquery-ui-sortable,moxiejs,plupload&ver=5.7.2:5
S.<computed> @ load-scripts.php?c=0&load[chunk_0]=jquery-core,jquery-migrate,utils,jquery-ui-core,jquery-ui-datepicker,jquery-ui-mouse,jquery-ui-sortable,moxiejs,plupload&ver=5.7.2:2
t @ ebac-reports-functions.min.js?ver=1.0:1
(anonymous) @ ebac-reports-functions.min.js?ver=1.0:1
dispatch @ load-scripts.php?c=0&load[chunk_0]=jquery-core,jquery-migrate,utils,jquery-ui-core,jquery-ui-datepicker,jquery-ui-mouse,jquery-ui-sortable,moxiejs,plupload&ver=5.7.2:2
v.handle @ load-scripts.php?c=0&load[chunk_0]=jquery-core,jquery-migrate,utils,jquery-ui-core,jquery-ui-datepicker,jquery-ui-mouse,jquery-ui-sortable,moxiejs,plupload&ver=5.7.2:2