Increase max username length for MySQL to 32 characters
In Plesk MySQL database usernames are limited to 16 characters, however MySQL 5.7+ allows usernames for up to 32 characters. Please update the max length limit in Plesk.
If username is too long Plesk will show an abstract error like 'Database user name is invalid'. In case of too long usernames, the error could be more descriptive.
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rdk
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Allowed length of Plesk DB user names for MySQL version 5.7.8 and higher – 32 characters in Plesk Onyx 17.9 Preview 13 https://docs.plesk.com/release-notes/onyx/change-log/#179-preview13
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IG