Thanks Tim. I cannot find any definitive documentation on the naming of plugins/subplugsin, apart from being lower case. However, I have also not found any other examples which include digits in their name and I did find mod_turnitintooltwo which suggests that I should rename my subplugin to ltiservice_outcomestwo (named because it is an implementation of the Outcomes Management 2 specification). In which case this would also mean a similar change to the database table name.
LTI and Moodle
Support for LTI Outcomes Management 2 services
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