I had the same thing that Texans did. I had to accept around 25 gifts one at a time and then tried the accept all and then it worked.
Here is the detail of the error: 2023-07-14 11:43:15.805 WARNEXCEPTION: ERROR Ajax: Error decoding json:
fail - Exception: Newtonsoft.Json.JsonReaderException: Unexpected end when reading JSON. Path '', line 1, position 4.
at Newtonsoft.Json.JsonTextReader.MatchValue (System.Boolean enoughChars, System.String value) [0x00000] in <00000000000000000000000000000000>:0
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