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The service is seemingly running, but when I query a tile such as: http://localhost:8080/tms/NPI-Svalbard-ortofoto/webmercator/18/142454/36289.png or http://localhost:8080/tms/NPI-Svalbard-ortofoto/webmercator/12/2222/567.png, I get a completely empty tile:

The service is seemingly running, but when I query a tile such as: http://localhost:8080/tms/NPI-Svalbard-ortofoto/webmercator/18/142454/36289.png (should cover this area - link obtained through this form) or http://localhost:8080/tms/NPI-Svalbard-ortofoto/webmercator/12/2222/567.png (ie this area), I get a completely empty tile:

This question: Locating TMS tile z/x/y where y>2^z describes a similar situation. There, mapproxy is used to serve TMS tiles using a WMS endpoint. Instead of empty tiles, the tiles served are not the expected webmercator tiles. Maybe a similar situation is at play here: perhaps the above links (such as http://localhost:8080/tms/NPI-Svalbard-ortofoto/webmercator/18/142454/36289.png or http://localhost:8080/tms/NPI-Svalbard-ortofoto/webmercator/12/2222/567.png) are not returning webmercator tiles! If they aren't webmercator tiles, it could be that 18/142454/36289 and 12/2222/567 both point to areas not imaged (such as seas), which could explain why the tiles returned are empty.