Length of domainname

My domain is: steunlokalekunstenaardienameizonderomzetzitenbroodopdeplankwil..nl

The provider enables free let's encrypt
When i demand for an validation, let's encrypt gives a failure. Is that because of the length? How to solve this problem?

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There is a typo in the name above - it has ".." [which is not allowed]
Presuming the name is with one dot, the overall length is 65 chars; and that is too long to fit into the CN of any cert (not just LE certs).

The only way to use that name in a cert is to have another name be the CN and include that name as one listed in the SAN.