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Replace the URL for MAP_TILE_URL to be https://tile.thunderforest.com/atlas/{z}/{x}/{y}.png?apikey=84452deb15d84fcaa8ad4986f7ef8ca4(Contact Support)
Steps To Take
Log into the dashboard as the Administrator/Admin User
Navigate to the ‘Dashboard Configuration’ menu (using the spanner icon)
Open the ‘Settings’ tab
Under 'Global Variables' tab, find the 'System Variables: Maps' section
Replace the existing URL for MAP_TILE_URL with the following link, then save your changes;
https://tile.thunderforest.com/atlas/{z}/{x}/{y}.png?apikey=84452deb15d84fcaa8ad4986f7ef8ca4(Contact Support)