passing URLS with appended query strings for a two wave survey

Hi, we have two waves of our survey, so it is a longitudinal design.
In wave 1 survey, I have created a random ID to identify each participant called RandomID (no spaces in name so URL should be happy)
Then I use email trigger (that is sent once survey is completed) to pass the URL link for wave 2 to the respondents.
I have set up the variable RandomID in wave2 survey as an emebdded variable to be imported form the URL at the top of wave 2 survey before block 1 begins
I copied the URL from wave 2 (using Distributions/anonymous survey link which I then pasted into survey wave 1 email trigger email
I am using the following phrase in the email trigger email
>The anonymous link is https://researchsurveys.deakin.edu.au/jfe/form/SV_5vjajdE70IYOyhf?Wave=wave1&RandomID=${e://Field/RandomID?format=urlencode}
However I cant get the URL passing to pass the RandomID value. The text description box in survey wave2 where I pipe the embedded variable RandomID into just shows a blank.
I had to go into the html to get this to work because just copying and pasting the anonymous survey link from wave 2 into the email trigger adds extra formatting. So the html now looks like this below.
The anonymous link is https://researchsurveys.deakin.edu.au/jfe/form/SV_5vjajdE70IYOyhf" style="box-sizing: border-box; color: rgb(0, 122, 192); cursor: pointer; font-family: "72","helvetica neue",helvetica,arial,sans-serif; font-size: 17px; font-style: normal; font-variant: normal; font-weight: 400; letter-spacing: normal; orphans: 2; outline-color: invert; outline-style: none; outline-width: medium; text-align: center; text-decoration: none; text-indent: 0px; text-transform: none; -webkit-text-stroke-width: 0px; white-space: normal; word-spacing: 0px;" target="_blank">https://researchsurveys.deakin.edu.au/jfe/form/SV_5vjajdE70IYOyhf?Wave=wave1&RandomID=${e://Field/RandomID?format=urlencode}  />
Can you please tell me why it is not working?
Could it be due to the html code?   Or could it be due to permission levels? Does one have to have a certain permission level to pass variables between surveys? I am singed in via my university which has an institution account and so should have the permissions, set for passing, right?
PS Can you pls put some info about 1. no spaces in variable names, 2. formatting html of the URL and 3. permission levels
into the Qualtrics help pages for Passing Information via Query Strings
many thanks, jem