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10mm pipe is very narrow for mains water, typically you would use 15mm otherwise have issues with flow rate.
Have a look at a 1-2M stretch of the pipe and see if you can make out the brand of the pipe used it should be written on the pipe.
Around 10-15 years ago there was a range of pipe and connectors out there, as there wasnt really a standard, so it may well be this is the issue, and you need to see if you can get the correct brand of connection.
Failing that a compression joint would be the next thing you could do, but though widlely used I try and avoid compression joints on plastic pipes.