A couple of books that should be of interest:
https://www.peterwohllebenbooks.com/the-hidden-life-of-trees
There is lots of mechanisms of why inverebrate would need the mycorrhizal fungus.
Off the top of my head, the fungus might produce a vitamin for that animal, that the plant does not, or the aminoacids are more blanced if MR fingis is present (those are hypotheses, I do not know for sure what is the mechanism).
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Not sure how generalisable that is, but I know that invasive pines are made much more invasive if they can associate with the right ECM fungi in their invasive range (see for example this paper: https://doi.org/10.1111/nph.15660
Some key sentences from the introduction:
“A well-known example of the role of mycorrhizal fungi in plant invasions is the case of pines and their co-invading ectomycorrhizal fungi (EMF). Although both plants and fungi disperse independently, if EMF are absent in the novel habitat, pines are not able to establish and survive as a result of the obligate nature of this symbiosis (Briscoe, 1959; Nuñez et al ., 2009; Dickie et al ., 2010). Therefore, the co-introduction of competent fungi has been crucial in overcoming the barriers against establishment and has inadvertently led to several cases of pine invasions (Richardson et al ., 2000).”
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Video on aquatic mushroom:
https://www.youtube.com/watch?v=5-f3esRYw18
Upcoming lecture on aquatic mushrooms: