I guess the message here is ‘be prepared’

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Yep,  If you had read and understood the terms of listing and managed payments, then you would have been fully aware that as a new/infrequent seller, your funds would be held for 30 days, with a % possibly held for 60 days.

If you contact ebay CS and politely ask for your funds to be released early, you may be lucky, but it is solely at ebays discretion.