I cannot sign into your service. And, when I attempt to sign using your Ebay Sign-in feature... the results is Page Not Found. We couldn't find the page you were looking for.
Please start with the home page and try again.
It has a picture of a cat on the page - with glasses.

Hello Pierre,
Thank you for the report about the auth step. This should work ok now.
If not, please tell me how to reproduce the problem and we can take the next step.

same issue

In the log file we keep, it shows your auth was accepted and ok. Perhaps you could try to clear your cache and try again?

I tried to sign in via multiple devices and multiple browsers.
The error occurs on every computer or laptop and - on each device - it fails with Edge, Chrome, Firefox and Opera.

Thank you for your question about logging in. Make sure that you are not using your eBay password, since we don't use that.
Use this link to reset your password with us.
https://bidslammer.com/user/mailpass
If that doesn't solve the issue, I'll watch for your reply and we can take the next step.

Same result. Kitty wearing glasses. Page not found.
I tested this on a brand new apple macbook air m3.
Just unboxed.

Could you tell me the steps you are taking? I'm not clear if you are trying to log in, mail a password, sign up, and so on.
Perhaps if you can give the URL at the top, when you see the cat. That will help very much. I'll provide some credit for your time.

Main Website
https://bidslammer.com/
Sign-In
https://bidslammer.com/user/login/
Recover or Change Password
https://bidslammer.com/user/mailpass/
Help! I no longer have access to the email you have for me.
(this is not true - but it is the only method I've found to get to the eBay link/connection)
(this doesn't open a URL - it does a JS Visible = true.
Ebay Sign in with eBay (Blue Button) - CLICK
This is where the cat image comes in. Sometime it displays.
Other times, you get the next message.
Next Stop: eBay Authorization
We require your authorization to bid for you and import your Watch List.
https://bidslammer.com/user/signup/
eBay Sign-in Screen
https://signin.ebay.com/SignIn.....xxxxxxx...
Enter UN/PW - Accepted
Simply your sign-in (ebay) - skip for now.
eBay Grant Application Access: BidSlammer - Agree
https://auth.ebay.com/oauth2/authnauthconsent?...xxxxxxx...
Now In BidSlammer website - dashboard
https://bidslammer.com/user/view/?msg=authok

and I forgot to add... the next time I want to use the service...
I have to repeat the above stated process.
Which doesn't always work.

I think I found the issue. You joined in 2021. Did you sign up under a different eBay ID? And since then, have changed that ID?
In 2022, we started checking for that situation, but before 2022, I have to manually update it.
If you did not change the ID, let me know, and I will do a walk-through with what you provided plus our log file.

Nope... didn't change it. I was customer with PowerSnipe.com for years... probably like 10 or so.
Then I guess you guys bought them out ?
At that point... I really wasn't using eBay that much - and I do remember several years of paying for the service - but never actually using it.
And honestly, I still don't use eBay much - which is also why I don't use a sniping service often - as well.
I think I started with eBay in 1999. Powersnipe probably around 2008 or so... which would mean I was a PowerSnipe.com customer for longer than I remember.

That's it. It's trying to record the referral, which we took out, since they took their site down. We didn't buy them, but they referred their traffic to us if we promised a discount.
I'll take care of this ASAP and write back hopefully before the weekend is over.

I updated your auth "token" manually. I logged in as you and it seems to work ok.
Use this link to reset your password with us.
https://bidslammer.com/user/mailpass
If that doesn't solve the issue, I'll watch for your reply and we can take the next step.