I don't know if this is by deisgn or some incorrect configuration.
Setup using ctrlX WORKS Version 1.20 (this has also been tested and works the same way for Versio 1.18)
By default configuration you recieve the following error when trying to install IODD file into ctrlX IO Engineeering device description.
We can confirm the error message by visiting the add-on installer
Solution
Within the CodeSys - Addon Profinet Controller you can find the IO-Link package (as you will see below, this works for Ethercat, not use profinet)
Here we have installed the package
And here we can see the IODD file will now install and can be used in configurating the IO
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