@N6NG Assuming you are using jalibu/MMM-RAIN-MAP, the options in the README has the following info:

`Option to use an alternative map. In most cases you are fine with the default but you can find more maps` here.

Type: string
Default value: 'https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png'
Alternative uncolored map: 'https://tiles.wmflabs.org/bw-mapnik/${z}/${x}/${y}.png'

With here pointing at the Tile Servers wikipedia.

It seems to me that the expected usage is to leave the {s}, {x}. {y}, and {z} alone.