User Macro in Item Key Fail

[klabarre]

Zabbix 4.0
Attempting to use a user macro in an item key results in "Special characters "\, ', ", `, *, ?, [, ], {, }, ~, $, !, &, ;, (, ), <, >, |, #, @, 0x0a" are not allowed in the parameters.". This is supported according to the documentation.

[tim.mooney]

Have you verified that you've entered the macro like

{$YOUR_MACRO}

? The $ goes inside the { }.

When you view the host (Configuration->Hosts, find the link for the host and click it) and switch to the Macros tab and click the "Inherited and host macros", does your macro appear in the list? Does its value contain any of the characters from that list?