Hello Support:
Currently, I have a odd issue regarding GPString data type. following is my definition for parameter. All are working well in ArcMap ToolBox. After I publish this tool as GP. then ran. It will give me a error if I give a long number for that.

following was error from ArcGIS Server(10.8.1) retrun. If I add a letter in this string. (1234567891123456789434343a), working.

(I thought this is bug for ArcGIS Server)
Any advice from this.
Thanks